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Very Small Array

The Very Small Array is a 14-element interferometric radio telescope operating between 26 and 36 GHz that is used to study the cosmic microwave background radiation. It is a collaboration between the University of Cambridge, University of Manchester and the Instituto de Astrofisica de Canarias (Tenerife), and is located at the Observatorio del Teide on Tenerife. The array was built at the Mullard Radio Astronomy Observatory by the Cavendish Astrophysics Group and Jodrell Bank Observatory, and was funded by PPARC (now STFC). The design was strongly based on the Cosmic Anisotropy Telescope.

The telescope is comparable in terms of capabilities to several other CMB experiments, including the balloon-based BOOMERanG and MAXIMA, and the ground-based DASI and CBI.

Design

The telescope consists of 14 elements (yielding 91 baselines), each of which have a horn reflector antenna focusing astrophysical signals into individual receivers (pseudomorphic HFET amplifiers, with a system temperature around 25 K and a physical temperature of 12 K, based on an NRAO design). The separate elements are combined using a correlator to form an aperture synthesis array. The elements are mounted on a tip-table, which is capable of tracking the sky and can tilt up to 35 degrees from the zenith.

The telescope has been used in three different configurations - 'compact', 'extended' and 'super-extended', each of which differ in the separation distance between the elements (the difference between compact and extended is a factor of 2.25), and the size of the antennas. While the compact array has antennas 143mm in diameter, the extended array uses 322mm diameter antennas. This means that the compact array has a primary beam of 4.5 degrees, and a resolution of 30 arcminutes (multipoles between 100 and 800), while the extended array has a primary beam of 2 degrees, a resolution of 12 arcminutes and can hence observe multipoles between 250 and 1500. The extended array is also a factor of 5 more sensitive than the compact array. The super-extended array will be able to measure multipoles up to 3000, and has 550mm antenna mirrors. The front-end amplifiers were also upgraded.

The telescope can be tuned to frequencies between 26 and 36GHz, with 1.5GHz bandwidth, meaning that the telescope can carry out observations at different frequencies.

It also includes two 3.7m radio telescopes, also working at 30GHz, which are dedicated to monitoring foreground sources. These source subtraction dishes were upgraded to more accurate ones following the first series of observations, to allow the monitoring of much weaker sources than previously.

Both the source subtractor dishes, and the VSA itself, are surrounded by large metal ground shields.

As the VSA is an interferometer, it directly measures the angular power spectrum of the CMB, rather than having to construct a map of the sky first.

Results

The fields observed with the VSA were chosen to minimize the amount of bright radio sources and large clusters in the field (the latter to avoid the Sunyaev-Zel'dovich effect), as well as to avoid contamination by emission from our galaxy. The radio point sources present in the VSA fields were observed with the Ryle Telescope at 15GHz, then monitored by the VSA source subtracters during the VSA observations.

In the compact array configuration, the telescope observed three 7x7 degree areas of the sky to high precision in an observing session between August 2000 and August 2001. These observations were taken at the highest frequency of the telescope, centered at 34GHz, to reduce foreground contamination. Another, larger area of the sky was also observed, but less precisely. The data from these observations were reduced independently at all three involved institutions. The results from these observations were published in a series of four papers in 2003; those by Watson et al., Taylor et al., Scott et al. and Rubino-Martin et al. (see References below). The key results were the power spectra of the Cosmic Microwave Background between multipoles of 150 and 900, and the resulting limits on cosmological parameters when combined with data from observations from other experiments.

The second observing session ran between September 2001 and July 2003, and was using the extended array. The first results from the extended array were published as a Letter in 2003, simultaneously with the first four publications, using data taken up until April 2002. The sections of the sky observed were located within the previously-observed fields, with the measurements being both more accurate and in greater detail. The result was an improved power spectrum of the CMB, going out to a multipole of 1400, and refined cosmological parameters. The second set of results were published in 2004, and consisted of the original observations plus more observations taken in the same regions of the sky, as well as observations in three new regions. This yielded measurements of the CMB power spectra out to l of 1500 much more accurately than previously, and more accurate cosmological parameter estimates.

Observations with the VSA continued until the end of August 2008, using the Super-Extended configuration. Also, the Ryle Telescope has been upgraded to detect lower flux point sources sources, and the OCRA receiver on a telescope in Poland will be used to more accurately subtract the point sources.

The Very Small Array's measurements of the CMB power spectra. From left to right: from first observations, the first results from the second observing session and the final results from the second observing session.

References and further reading

Journal articles

  • Watson, R. A.; et al. (2003). "First results from the Very Small Array I: Observational Methods". MNRAS 341 1057–1065. 0205378. | url=http://adsabs.harvard.edu/abs/2003MNRAS.341.1057W | doi=10.1046/j.1365-8711.2003.06338.x | format=abstract}}
  • Taylor, Angela C.; et al. (2003). "First Results From The Very Small Array II: Observations of the CMB". MNRAS 341 1066–1075. 0205381. | url=http://adsabs.harvard.edu/abs/2003MNRAS.341.1066T | doi=10.1046/j.1365-8711.2003.06493.x | format=abstract}}
  • Scott, P. F.; et al. (2003). "First results from the Very Small Array III: The CMB Power Spectrum". MNRAS 341 1076–1083. 0205380. | doi=10.1046/j.1365-8711.2003.06354.x | format=abstract }}
  • Rubino-Martin, J. A.; et al. (2003). "First results from the Very Small Array IV: Cosmological Parameter Estimation". MNRAS 341 1084–1092. 0205367. | url=http://adsabs.harvard.edu/abs/2003MNRAS.341.1084R | doi=10.1046/j.1365-8711.2003.06494.x | format=abstract}}
  • Grainge, Keith; et al. (2003). "The CMB Power Spectrum out to l = 1400 measured by the VSA". MNRAS 341 L23–L28. 0212495. | doi=10.1046/j.1365-8711.2003.06563.x | format=abstract }}
  • Slosar, Anze; et al. (2003). "Cosmological Parameter Estimation and Bayesian model comparison using VSA data". MNRAS 341 L29–L34. 0212497. | url=http://adsabs.harvard.edu/abs/2004MNRAS.353..747R | doi=10.1046/j.1365-8711.2003.06564.x | format=abstract}}
  • Maisinger, Klaus (2003). "Maximum-likelihood astrometric geometry calibration of interferometric telescopes: application to the Very Small Array". MNRAS 345 800–808. 0212210. | doi=10.1046/j.1365-8711.2003.06995.x | format=abstract }}
  • Savage, Richard (2004). "Searching for non-Gaussianity in the Very Small Array data". MNRAS 349 973–982. 0308266. | doi=10.1111/j.1365-2966.2004.07578.x | format=abstract }}
  • Dickinson, Clive; et al. (2004). "High sensitivity measurements of the CMB power spectrum with the extended Very Small Array". MNRAS 353 732. 0402498. | url=http://adsabs.harvard.edu/abs/2005MNRAS.360..340C | doi=10.1111/j.1365-2966.2004.08206.x | format=abstract}}
  • Smith, Sarah; et al. (2004). "Estimating the bispectrum of the Very Small Array data". MNRAS 352 887–902. 0401618. | url=http://adsabs.harvard.edu/abs/2004MNRAS.352..887S | doi=10.1111/j.1365-2966.2004.07885.x | format=abstract}}
  • Rebolo, Rafael; et al. (2004). "Cosmological parameter estimation using Very Small Array data out to l=1500". 0402466. | journal=MNRAS | volume=353 | pages=747–759 | url=http://adsabs.harvard.edu/abs/2004MNRAS.353..747R | doi=10.1111/j.1365-2966.2004.08102.x | format=abstract}}
  • Lancaster, Katy (2004). "Very Small Array observations of the Sunyaev-Zel'dovich effect in nearby galaxy clusters". MNRAS 359 16–30. 0405582. | url=http://adsabs.harvard.edu/abs/2005MNRAS.359...16L | doi=10.1111/j.1365-2966.2005.08696.x | format=abstract}}
  • Cleary, Kieran (2005). "Source subtraction for the extended Very Small Array and 33-GHz source count estimates". 0412605. | url=http://adsabs.harvard.edu/abs/2005MNRAS.360..340C | journal=MNRAS | volume=360 | pages=340–353 | doi=10.1111/j.1365-2966.2005.09037.x | format=abstract}}
  • Génova-Santos, Ricardo; et al. "A Very Small Array search for the extended Sunyaev-Zel'dovich effect in the Corona Borealis supercluster". MNRAS 363 79–92. 0507285. | year=2005 | doi=10.1111/j.1365-2966.2005.09405.x | format=abstract}}
  • Rajguru, Nutan; et al. (2005). "Cosmic microwave background observations from the Cosmic Background Imager and Very Small Array: a comparison of coincident maps and parameter estimation methods". MNRAS 363 1125–1135. 0502330. | doi=10.1111/j.1365-2966.2005.09519.x | format=abstract }}
  • Rubiño-Martín, José Alberto (2006). "Non-Gaussianity in the Very Small Array cosmic microwave background maps with smooth goodness-of-fit tests". MNRAS 369 909–920. 0604070. | url=http://adsabs.harvard.edu/abs/2006MNRAS.369..909R | doi=10.1111/j.1365-2966.2006.10341.x | format=abstract}}

See also

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